package com.lad.utils;

import com.google.common.collect.Maps;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Enumeration;
import java.util.Map;

public class UtilWeb {

    public static HttpServletRequest currentRequestInSpring() {
        try {
            return ((ServletRequestAttributes)RequestContextHolder.getRequestAttributes()).getRequest();
        } catch (Exception var1) {
            return null;
        }
    }

    public static HttpServletResponse currentResponseInSpring() {
        try {
            return ((ServletRequestAttributes)RequestContextHolder.getRequestAttributes()).getResponse();
        } catch (Exception var1) {
            return null;
        }
    }

    public static String getBasePath(HttpServletRequest request) {
        String contextPath = request.getContextPath();
        return request.getScheme() + "//" + request.getServerName() + ":" + request.getServerPort() + contextPath + "/";
    }

    public static Map<String, String> getParamters(HttpServletRequest request) {
        Map<String, String> paramters = Maps.newHashMap();
        Enumeration<String> enumeration = request.getParameterNames();
        while (enumeration.hasMoreElements()) {
            String name = String.valueOf(enumeration.nextElement());
            paramters.put(name, request.getParameter(name));
        }
        return paramters;
    }

    public static Map<String, String> getHeaders(HttpServletRequest request) {
        Map<String, String> map = Maps.newHashMap();
        Enumeration<String> enumeration = request.getHeaderNames();
        while (enumeration.hasMoreElements()) {
            String name = String.valueOf(enumeration.nextElement());
            map.put(name, request.getHeader(name));
        }
        return map;
    }

    /**
     * 获取用户真实IP地址，不使用request.getRemoteAddr()的原因是有可能用户使用了代理软件方式避免真实IP地址,
     * 可是，如果通过了多级反向代理的话，X-Forwarded-For的值并不止一个，而是一串IP值
     *
     * @return ip
     */
    public static String getIpAddr(HttpServletRequest request) {
        String ip = request.getHeader("x-forwarded-for");
        if (ip != null && ip.length() != 0 && !"unknown".equalsIgnoreCase(ip)) {
            // 多次反向代理后会有多个ip值，第一个ip才是真实ip
            if( ip.indexOf(",")!=-1 ){
                ip = ip.split(",")[0];
            }
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("Proxy-Client-IP");
            System.out.println("Proxy-Client-IP ip: " + ip);
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("WL-Proxy-Client-IP");
            System.out.println("WL-Proxy-Client-IP ip: " + ip);
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("HTTP_CLIENT_IP");
            System.out.println("HTTP_CLIENT_IP ip: " + ip);
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("HTTP_X_FORWARDED_FOR");
            System.out.println("HTTP_X_FORWARDED_FOR ip: " + ip);
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("X-Real-IP");
            System.out.println("X-Real-IP ip: " + ip);
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getRemoteAddr();
            System.out.println("getRemoteAddr ip: " + ip);
        }
        return "0:0:0:0:0:0:0:1".equalsIgnoreCase(ip) ? "127.0.0.1" : ip;
    }
}